docs: def relocate_audio_to_single_container(self, target_path):
          """
          Copies every track to a single container.
          Afterwards all tracks in the container are linked against
          this single container.
          """
  
          cont = containers.AudioContainer(target_path)
          cont.open()
  
          new_tracks = {}
  
          # First create a new container track for all existing tracks
          for track in self.tracks.values():
              sr = track.sampling_rate
              samples = track.read_samples()
  
              cont.set(track.idx, samples, sr)
              new_track = tracks.ContainerTrack(track.idx, cont)
  
              new_tracks[track.idx] = new_track
  
          # Update track list of corpus
          self._tracks = new_tracks
  
          # Update utterances to point to new tracks
          for utterance in self.utterances.values():
              new_track = self.tracks[utterance.track.idx]
              utterance.track = new_track
  
          cont.close()